81results about How to "Precise control method" patented technology

The invention provides a grape planting method which comprises the steps of forming a seed bed, selecting a seedling cultivation measure and completing a planting process, wherein the step of selecting the seedling cultivation measure comprises four methods of cutting seedlings, layering the seedlings, grafting the seedlings and sowing and raising the seedlings; the step of completing the planting process comprises the method of completing fertilization, shoot fixing, flower and fruit thinning, tendril removing and cluster thinning in different stages of planting, and the method of completing frostbite prevention and treatment, bird trouble prevention and treatment and disease control during the whole process of planting. The grape planting method further comprises a planting method of short period maturing varieties and a potted plant grape planting method. By the grapple planting method disclosed by the invention, the accuracy control on the whole planting process in a grape growth cycle is effectively realized; nutrients are precisely supplied to shoots, leaves, flowers and fruits of grape at each planting stage; the nutrient supplying direction is effectively guided; the precise control method is provided for improving the yield and quality of the grape; detailed and operable technological means are provided for effectively overcoming insect pests and natural disasters.

The invention relates to a quadruped robot movement track control method based on a PSO-PD (Particle Swarm Optimization-PD) neural network. The quadruped robot movement track control method comprises the following steps: (1) calculating a target falling point of a robot on a movement track; (2) inputting the target falling point and a feedback body gravity center position into an input layer of the PSO-PD neural network, performing linear conversion, inputting into a first hidden layer, performing ratio calculation and differential operation, performing linear conversion, inputting into a second hidden layer, and acquiring instruction displacement in an x direction and a y direction, inputting into a third hidden layer, calculating an instruction displacement distance, instructing a body direction, inputting into a fifth layer, performing foot tract control and steering control on a quadruped robot, inputting into a sixth layer, adjusting the posture of the quadruped robot in case of disturbance, inputting into a seventh layer, calculating the body direction and the body gravity center position of the quadruped robot, feeding back the body direction to the fifth layer, and feeding back the body gravity center position to the input layer. The quadruped robot movement track control method has relatively good non-linear decoupling control capability, is precise in control and good in stability, and has relatively good anti-interference properties.

The invention relates to an air conditioner and a control method thereof, with the purpose to apply a fan motor operation information diagnosis room outer machine to arranging environment and operation condition, and to control number of revolutions of the fan motor according to variation of the outer operation condition, so as to compensate operation of the fan motor to meet target air quantity, therefore, the air conditioner with a fan motor for regulating outdoor air quantity provided in the invention comprises a current detection part for detecting operation current of the fan motor; a voltage detection part for detecting power supply voltage of the fan motor; a control part for measuring consumption power of the fan motor through product of the detected power supply voltage and the operation current, and diagnosing the preference of the outdoor machine.

The invention provides an indoor heat environment comfort evaluation thermal manikin system and an indoor heat environment comfort evaluation method. The indoor heat environment comfort evaluation thermal manikin system comprises a thermal manikin, a measuring and control system and an evaluation system. The thermal manikin has good joint motion capability, and has 16 independent measuring and heating control split regions; the split regions sufficiently consider the physiological structure characteristics of a human body and the heat exchange characteristics of the human body in the heat environment with the environment. The indoor heat environment comfort evaluation thermal manikin system has the advantages that the application range is wide; the system can be applied to heat environment in various fields such as civil use, military use, aero-space and navigation; the heat environment parameters can be directly and accurately measured; the heat environment comfort can be objectively evaluated; the test and the evaluation result is stable and accurate; the repeatability is high; the indoor heat environment comfort evaluation thermal manikin system conforms to the real human body heat state; the reasonableness and the reliability are realized.

Provided is a trajectory planning method for the autonomous and safe approaching to a rolling fault satellite. A dynamics model is established, by using an artificial potential field method and combining with the different rolling conditions of the fault satellite, the expected velocity of a service spacecraft is determined, a trajectory plan for the autonomous and safe approaching to the rolling fault satellite is made, and a sliding mode controller is designed to control the spacecraft to approach to the fault satellite through the planned trajectory. For the trajectory planning method for the safe approaching to the rolling fault satellite, a trajectory planning method based on artificial potential field idea is proposed. According to the geometrical outline features of the target, the corresponding path security constraints are designed, and thus the trajectory planning and control method are more accurate, the scope of application is widened, and the closed loop with respect the environment is realized; and meanwhile, the computational complexity is small, the online calculation is convenient, the trajectory planning can be carried out online in real time, the real-time property is good, and the control effect is optimal.

The invention discloses an intermediate compound, and a synthetic method of prothioconazole. The method comprises the following steps: carrying out a substation reaction on 5,5'-dithio-bis(1,2,4-triazole) and 2-(1-chlorocyclopropyl)-3-chloro-1-(2-chlorophenyl)-2-propanol to obtain the key intermediate compound; and reducing the key intermediate compound to obtain the target product prothioconazole. The synthetic method has the advantages of high conversion rate, high selectivity, cheap and easily available synthesis raw materials, reduction of the production cost, mild and easily controlled technologic reaction conditions, simplicity in operation, easiness in product purification, obtaining of the product through direct re-crystallization, simple and accurate control method of intermediates in all steps, high product yield, good atom economy, avoiding of tedious post-treatment, large competition advantages and industrial production utilization values, avoiding of strong alkalis and other raw materials, extremely low three wastes, and according with the green chemistry idea.

An energy-conservation low-voltage set aluminum electrolytic bath has a structure that a bath structure is provided with a cut-off device which can adjust the height of an interface of an aluminum liquid layer generated inside the electrolytic bath and can control the flow rate of the aluminum liquid, as well as an aluminum liquid storing tank which can carry out electrode heating for an aluminum liquid inside an aluminum containing tank and ensure that the generated aluminum liquid inside the electrolytic bath flows into the aluminum containing tank through a diversion hole under the control of the aluminum liquid cut-off device. The energy-conservation low-voltage set aluminum electrolytic bath solves the problems that the prior commonly used electrolytic bath can not realize continuous timely discharge and manual adjustment and control of the generated aluminum liquid; meanwhile, a feasible design proposal for the energy-conservation low-voltage set aluminum electrolytic bath is provided in order to realize timely discharge of the generated aluminum liquid inside the electrolytic bath under the condition of an electrolytic operating mode, to eliminate the negative influence on electrolyte height, namely high polar distance and high voltage set caused by a magnetic field and a magnetic rotational flow generated by an aluminum liquid layer, and to reduce the electricity consumption during manufacturing electrolytic aluminum under the condition that the electrolytic bath is in an operating mode of low polar distance and low voltage; moreover, the design proposal for the feasible energy-conservation low-voltage set aluminum electrolytic bath ensures that a voltage of the tank can be set lower than 3.75mV.

The invention discloses a pressure closed loop control method for large-circulation grouting monitor system, which comprises the following steps of: determining the upper and lower boundaries of system model parameters; choosing model variables and determining the structure of a grouting pressure control system model; acquiring a modeling algorithm for the support vector machine of the grouting pressure model; correcting the grouting pressure model; and controlling based upon the direct control policy of a grouting pressure predication model; the control method disclosed by the invention is accurate and good in operability, and brings great convenience to practical construction.

The present invention is cell DNA staining kit for use in life science and medicine, especially the sole staining of cell nucleus, and its preparation process. The kit includes DNA staining solution, DNA fixing solution and DNA rinsing liquid in the volume ratio of 1.05 to 2 to 1. It is prepared through the following steps: preparing DNA staining solution, preparing DNA fixing solution, preparing DNA rinsing liquid, preparing cell preserving solution, and setting slide glass, the DNA staining solution, the DNA fixing solution, the DNA rinsing liquid and the cell preserving solution into a box to constitute the cell DNA staining kit. The present invention facilitates cell DNA staining and raises the accuracy.

The invention relates to a method for controlling the pressure of a propellant storage box. The method comprises the following steps: (1) establishing a boosting system; and (2) starting a control center, realizing control over the pump inlet pressure according to a pump inlet pressure curve required by a user, and realizing control over a front stable segment, a boosting segment, an overload segment, a discharging segment and a back stable segment in sequence, wherein the pump inlet pressure curve comprises the front stable segment, the boosting segment, the overload segment and the discharging segment which are connected in sequence. According to the method, specific to the aim of realizing stability from the front stable segment to the overload segment within a time interval required by an assignment book by accurately controlling the pump inlet pressure, factors such as the pressure reducer outlet pressure, propellant flow and calculated flow adjusting coefficient influencing the boosting time of a propellant boosting system are researched, so that the problem of corresponding requirement on the test pump inlet pressure and time of an engine is solved, the outlet boosting coefficient of a pore plate is analyzed, calculated and optimized, and an accurate control method is concluded.

The embodiment of the invention provides an automatic parking control method and device and a controller. The method comprises the steps: receiving an automatic parking request signal of a user; responding to the automatic parking request signal, and obtaining vehicle parameters of a vehicle and a reference track of the vehicle driving to a parking position from the current position; obtaining a preview distance through a preset preview distance model according to the current vehicle speed; determining a first parameter for transversely controlling the vehicle according to the preview distance, the target position, the vehicle steering transmission ratio and the vehicle axle distance, the first parameter comprising a steering wheel angle of the vehicle; and adjusting a steering wheel of the vehicle according to the steering wheel rotation angle of the vehicle so as to control the vehicle to perform automatic parking. According to the embodiment of the application, the automatic parkingcontrol of the vehicle can be realized.

The invention relates to a method to control power output of a doubly-fed induction machine to a grid including the steps of measuring grid voltage and grid current in a three phase coordinate system, transforming grid voltage and grid current into a stator frame coordinate system, decomposing the grid voltage and grid current in the stator frame coordinate system in a positive sequence system and in a negative sequence system, calculating active and reactive power in the positive and negative sequence system, and controlling active and reactive power in the positive and negative sequence system.; The object to provide a method to control power output of a doubly-fed induction machine which provides good dynamics and is able to allow fault-ride-through operations when unbalanced grid voltages occurs is solved in that active and reactive power in the positive and negative sequence system are used as independent state variables in a state controller, whereas the state controller generates manipulated values in the positive and negative sequence system separately which are subjected as manipulated state vectors to a state feedback in a stator frame coordinate system without further control loops before the manipulated vector resulting from state feedback is used to set the rotor voltage.

An agricultural unmanned aerial vehicle (UAV) control method comprises an UAV. The UAV at least comprises a flight platform, a speed sensor, a spray system, a processor, and a plurality of positioning modules. The positioning modules surround a farmland at equal intervals to form an operation area. The method comprises the following steps: the positioning modules are arranged at equal intervals at the edge of a farmland to form an operation area; detection parameters are set for the UAV, including the interval value; the UAV flies at the position of one positioning module, and forms an operation area; and the UAV sprays pesticide from the starting position, the speed and position needing turning are calculated according to the flight distance and the positions of the positioning modules to make the UAV turn in the operation area, and there is no need to close the spray system. Pesticide spraying can be controlled more accurately.

The invention discloses a control method for protecting an air compressor of a finished vehicle. The method specifically comprises the steps of presetting the characteristic curve Air-MAP of the air compressor in an electronic control unit (ECU) in advance, wherein the characteristic curve Air-MAP of the air compressor contains the air compressor efficiency value Eta demarcated according to the pressure ratio Pi and the fresh air inflow m; acquiring the outlet pressure of the air compressor, fresh air inflow and ambient pressure by means of the ECU, and searching for the characteristic curve Air-MAP of the air compressor according to the ratio of the outlet pressure of the air compressor to the ambient pressure and the fresh air inflow to obtain the outlet temperature of the air compressor under the current working condition; sending out a control signal for regulating the fuel injection quantity of an engine under the condition that the outlet temperature of the air compressor is beyond the preset temperature range of the air compressor. By means of the control method, the outlet temperature of the air compressor can be controlled effectively in real time, and then damage of the air compressor caused by overheating can be totally avoided and detection of the efficiency of an intercooler is facilitated.

The invention discloses a novel heat exchanger capable of automatically adjusting a heat exchange area. The heat exchanger comprises a shell, a first channel and a second channel symmetrically arranged on two axial sides of the shell, a first sealing plate and a second sealing plate symmetrically sealed on two axial sides of the shell for dividing the shell, the first channel and the second channel into a shell cavity, a first channel cavity and a second channel cavity, heat exchange pipes arranged in the shell in parallel at equal intervals and communicating with the first channel cavity andthe second channel cavity by two ends, a piston arranged in the first channel cavity and tightly contacted with the inner wall of the first channel cavity in the peripheral direction and capable of moving in the axial direction of the first channel cavity, and a driving mechanism connected with the piston by an output end and used for driving the piston to move in the axial direction of the firstchannel cavity. The invention further provides a flow adjusting method of the novel heat exchanger capable of automatically adjusting the heat exchange area; the heat exchange is guaranteed; and the energy is saved.

The invention relates to a combustion control method of a gas water heater. The gas water heater comprises a combustor, a proportional valve, a fan and a controller, and is characterized in that a wind pressure sensor is arranged at an exhaust port of the gas water heater, the wind pressure sensor is also connected with the controller, and a wind pressure reference database and a fan rotation speed compensation database are preset and stored in the controller. Compared with the prior art, the method has the advantages that when external wind pressure does not exist, detection values of the fanat different rotating speeds through the wind pressure sensor are stored in advance as wind pressure reference values, the rotating speed compensation amount required of the fan at different reference rotating speed conditions and different wind pressure values existing outside is stored in advance as well, so that the influence of wind pressure generated by the fan on the detection value of thewind pressure sensor can be well avoided, and meanwhile, adjustment on the rotating speed of the fan is accurately controlled, and the control method is more accurate.

The invention discloses a laser micro structure machining method. The laser micro structure machining method includes the following steps that a three-dimensional movement model of a machine tool is built, the real-time positions of a linear shaft and a rotating shaft of the machine tool are converted into machining machine tool coordinates; a to-be-machined workpiece is moved to a machining position, the machining position is set to be a machining original point, and a machine tool coordinate system is updated; machining position parameters are read, and laser machining position coordinates are calculated and obtained; according to the coordinates, a machining schematic diaphragm is calculated and generated, and analog simulation is performed on the machining effect; G codes are generatedaccording to the coordinates, and used for path planning of a movement platform in machining; and a controller controls a machining machine tool to move according to the G codes, the obtained laser machining coordinates and machining machine tool coordinates read in real time in the machining process are compared, when the obtained laser machining coordinates and the machining machine tool coordinates read in real time in the machining process are consistent, it is considered that the workpiece moves to an assigned position, and therefore a laser device is controlled to emit out light, and laser micro structure machining is performed. The laser micro structure machining method can achieve high precision machining, improves the control synchronism of the laser device and machine tool movement, and effectively improves the laser micro structure morphology observing difficulty.

The invention discloses a device for drawing a map, which resides in computing equipment. The computing equipment includes a display. The device includes a data receiving module, an entity constructing module, and a graph drawing module. The data receiving module is suitable for receiving one or more GIS data sources which are used to represent graphs in a map. The entity constructing module is suitable for constructing an entity corresponding to one or more graphs in the map according to the GIS data sources received, wherein the entity includes one or more content components which describe the graphs corresponding to the entity. The graph drawing module is suitable for loading the content components contained in the constructed entity, drawing the graphs described by the content components and presenting the graphs through the display of the computing equipment. The invention further discloses a corresponding method, a piece of computing equipment and a readable storage medium.

The invention relates to the technical field of preparation processes, in particular to a method for controlling genotoxic impurities in a metformin hydrochloride sustained release tablet preparation process, which comprises the following steps of: controlling the content of impurity dimethylamine in a raw material medicine metformin hydrochloride and the content of impurity nitrite in an auxiliary material hydroxypropyl methylcellulose; effective control of the genotoxic impurity N-nitrosodimethylamine is achieved, side reactions of medication of patients are reduced, and medication safety of the patients is guaranteed to a certain extent; the content of the genetic toxic impurity N-nitrosodimethylamine of the metformin hydrochloride sustained-release tablet is far lower than that of the State Food and Drug Administration and an acceptable limit specified by FDA (Food and Drug Administration).

The invention discloses a single cylinder pin-type telescopic arm pin reverse buckling control method and a system thereof, and a crane. The method is characterized in that a telescopic arm arrives at a corresponding telescoping position, then a control arm pin is inserted into a corresponding arm pinhole; the retraction of the telescopic arm is controlled by controlling a hydraulic system; after pre-setting a period of time, whether the monitored pump pressure of the hydraulic system reaches the pump pressure threshold of the arm pin at the bottom of the arm pinhole or not is determined; if the monitored pump pressure of the hydraulic system reaches the pump pressure threshold, the arm pin moves to the bottom of the arm pinhole, and the telescopic arm is controlled for stopping retraction. The telescopic arm pin reverse buckling control method is more accurate, avoid damage on a telescoping oil cylinder and the arm pin by artificial arm pin reverse buckling, and increases the telescoping security of the telescopic arm.

The invention provides a wind guide device, a wind guide control method and an air conditioner. The air conditioner comprises a shell and a wind wheel assembly. A ventilation area is arranged on the peripheral wall of the shell. The wind wheel assembly is mounted in the shell. The wind guide device comprises a wind channel assembly and at least one wind shield. The wind channel assembly is mounted in the shell and connected with the shell to define a wind channel communicating with the ventilation area. The wind shields are arranged on the shell in a sliding manner and located in the ventilation area. By means of the wind guide device, wind generated by working of the wind wheel assembly slides to different positions in the ventilation area through at least one wind shield, and the wind channel in the shell communicates with the outer environment through different parts of the ventilation area so that multiple wind outlet manners of the air conditioner can be achieved; and meanwhile, the structure of the air conditioner is simplified, repair and maintenance are facilitated, the production cost is reduced, market competitiveness is improved, and the use satisfaction degree of users is increased.

The invention provides a control method and system for a vehicle air conditioner, and a vehicle, and belongs to the field of vehicles. The control method comprises the following steps that the pressure value of a refrigerant is collected; the pressure value at the current time and the pressure value at the last time are compared; when the pressure value is increased, the pressure value at the current time is compared with a first high-pressure protective value and a first low-pressure protective value, if the pressure value at the current time is larger than the first low-pressure protective value and less than the first high-pressure protective value, a fan of the air conditioner outputs the corresponding rotational speed according to the current pressure value, or otherwise a compressoris cut off; and when the pressure value is decreased, the pressure value at the current time is compared with a second high-pressure protective value and a second low-pressure protective value, if thepressure value at the current time is larger than the second low-pressure protective value and less than the second high-pressure protective value, the fan outputs the corresponding rotational speedaccording to the current pressure value, or otherwise the compressor is cut off. The invention further provides the corresponding control system and the vehicle with the same. According to the controlmethod, the control system and the vehicle, the situation of refrigerant leakage can be effectively reduced.

The invention provides a temperature control method and system and semiconductor equipment. The temperature control method is used for controlling the temperature change of a chamber. The method comprises the following steps: establishing a model: controlling a chamber heating device to output different test power values to the chamber, obtaining actual temperature values, corresponding to the test power values, of the chamber, and establishing a model according to the relationship between the actual temperature values and the test power values, wherein the model is used for representing the relationship between the chamber temperature and the heating power; calculating a global parameter table based on the model, wherein the global parameter table is used for representing a correspondingrelationship between the chamber temperature value and the heating power value; and controlling the heating power value output by the chamber heating device according to the global parameter table soas to control the temperature change of the chamber. According to the invention, the temperature of the chamber is flexibly and accurately controlled.

The invention discloses an intelligent buoyancy type flood control and water retaining device for a ventilation pavilion and a control method. The device comprises a water retaining plate, a shell, a buoyancy assembly, an on-site monitoring system and an electrical control unit. The overall structure of the water baffle is matched with the shape of the ventilation pavilion, and the water baffle is formed by splicing a plurality of water baffles. The shell accommodates the buoyancy assembly and the water baffle, a water inlet hole is formed in the bottom, an extending opening is formed in the top, and a sealing tape is arranged between the extending opening and the baffle. The buoyancy assembly comprises a buoyancy device and a guide device. The buoyancy device drives the water baffle to float upwards. The guiding device is used for guiding the buoyancy device. The on-site monitoring system collects water level information and water baffle state information at the corresponding position of a position sensor in real time through a water level gauge and the position sensor, and transmits the information to the electrical control unit. Compared with preset parameters, judging and displaying are performed. The flood prevention capacity of the ventilation pavilion in rainstorm is improved, the station is prevented from being flooded, and subway operation safety is ensured. The automation degree of monitoring is improved, the speed is high, and the efficiency is high.

The invention provides an intelligent lifting type flood control water retaining device for a fan pavilion and a control method. The device comprises a baffle assembly, a shell, a lifting assembly, a field monitoring system and an electrical control unit, wherein the baffle assembly is matched with the fan pavilion in shape; a sealing rubber strip is arranged on the periphery of the bottom of a baffle; the shell contains the lifting assembly and the baffle assembly and covers a foundation of a fan pavilion opening; a lifting opening is formed in the top of the shell; the sealing rubber strip seals the lifting opening when the baffle ascends; the lifting assembly comprises a linkage lifting mechanism and a motor; the field monitoring system comprises a water level gauge and a position sensor and collects information; and the electrical control unit receives the information and drives the linkage lifting mechanism to ascend and descend by controlling the motor to rotate forwards and backwards, and the baffle is made to stretch out and retract. The lifting mechanism is automatically controlled to drive the baffle to ascend and descend, the flood control capacity of the fan pavilion during rainstorm is improved, a station is prevented from being flooded, and the operation safety of a subway is ensured; and the automation degree is improved, the speed is high, and efficiency is high.

The invention discloses a workshop air conditioner control method and system. The control method comprises the following steps of acquiring a predicted temperature interval and a predicted relative humidity interval of an external environment within a preset time period; when the predicted temperature interval completely falls into a first temperature interval and the predicted relative humidity interval completely falls into a first relative humidity interval, controlling a first electric switch to be switched off at a starting time point of the preset time period, and no switching on in thepreset time period; and when the predicted temperature interval does not completely fall into the first temperature interval or the predicted relative humidity interval does not completely fall into the first relative humidity interval, controlling the first electric switch to be switched on at the starting time point of the preset time period, starting the air conditioner in the warehouse, and adjusting the air conditioner in the warehouse to initial preset power. According to the technical scheme, the workshop is divided into a production workshop and a warehouse, the air conditioner is subjected to energy-saving control respectively according to different characteristics of the workshop and the warehouse, the control method is more accurate and intelligent, the energy-saving effect of the air conditioner is better, and the production cost of an enterprise is reduced.

The invention relates to a control method of a flame indication module of cookers. A voltage analogue signal on a flame detecting device close to a furnace head is amplified via an amplifying device, then the signal is converted into a digital signal via an A / D conversion circuit; a controller collects the digital signal in every other sampling period; the collected digital signal is compared with a flameout critical value; when the digital signals collected in pre-set collecting times are lower than the flameout critical value, the controller closes a light-emitting element. According to thecontrol method, when the flame leaves the flame detecting device for a certain time, the signal collected by the controller is lower than the flameout critical value in the set time, then the flame is judged to extinguish, and the light-emitting element is closed; when the flame deviated caused by wind or spilling water, etc is recovered soon, if the pre-set valve is appropriate, an error indication of the light-emitting element is not existed.

The invention discloses a self-locking injection nozzle device and a locking control method thereof. The self-locking injection nozzle device comprises a nozzle jacket, a glue penetrating valve, a jet nozzle, an ejector pin and an ejector pin drive lever, through a structure design and coordination of the ejector pin drive lever, the jet nozzle, a molten material runner and the ejector pin, the drive device automatically pushes the ejector pin to lock an injection orifice through the ejector pin drive lever during melting of glue; when a glue storage cavity of the jet nozzle full of molten mass reaches certain pressure, the ejector pin automatically retreats to open the injection orifice to inject the glue under the pressure action of the molten mass, so that the injection nozzle device has the advantages of being simple in structure, easy to produce and fabricate, low in production cost and the like; particularly, the sealing by automatically blocking the injection orifice is effectively achieved; the molten mass is prevented from casting in the glue melting process; and the molten mass pushes the ejector pin to retreat by the pressure of the molten mass to open the injection orifice, so that the control method is simple and accurate; the process is controlled without the drive device; and energy sources are saved.

The invention discloses a power grid loop-closing control method which comprises the following main steps: drawing a simplified equivalent circuit according to a power grid loop-closing network; acquiring the equivalent impedance in the loop-closing ring network and the loads on buses on the two sides of a tie line; working out the complex power flowing to the tie line buses according to the characteristics of the ring network; subtracting the load flowing out of the bus on one side of the tie line from the complex power flowing to the bus to get circular complex power; calculating the loop-closing steady-state current and loop-closing impact current based on the circular complex power; and comparing the loop-closing steady-state current with the maximum allowable work current of the tie line and comparing the loop-closing impact current with the over-current quick-break protection trigger current, and judging whether loop-closing operation can be performed. The method of the invention is simple and practical, safe and reliable, and applicable to loop-closing operation of both the main network and the distribution network, and can provide a basis for power grid loop-closing operation and help power dispatchers to make reasonable and beneficial adjustment on the power grid operation mode through loop closing so as to improve the reliability of power supply and guarantee the interests of users.